Ankit Shukla, Friedrich Slivovsky, Stefan Szeider. Short Q-Resolution Proofs with Homomorphisms. Proceedings of SAT 2020, The 23rd International Conference on Theory and Applications of Satisfiability Testing (Luca Pulina and Martina Seidl), volume 12178 of Lecture Notes in Computer Science, pages 412-428, 2020, Springer Verlag.